[PATCH 6/7] xfs: don't expose internal symlink metadata buffers to the vfs

Darrick J. Wong
2021-12-16T01:09:52Z

From: Darrick J. Wong <djwong@kernel.org>

Ian Kent reported that for inline symlinks, it's possible for
vfs_readlink to hang on to the target buffer returned by
_vn_get_link_inline long after it's been freed by xfs inode reclaim.
This is a layering violation -- we should never expose XFS internals to
the VFS.

When the symlink has a remote target, we allocate a separate buffer,
copy the internal information, and let the VFS manage the new buffer's
lifetime. Let's adapt the inline code paths to do this too. It's
less efficient, but fixes the layering violation and avoids the need to
adapt the if_data lifetime to rcu rules. Clearly I don't care about
readlink benchmarks.

As a side note, this fixes the minor locking violation where we can
access the inode data fork without taking any locks; proper locking (and
eliminating the possibility of having to switch inode_operations on a
live inode) is essential to online repair coordinating repairs
correctly.

Reported-by: Ian Kent <raven@themaw.net>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
fs/xfs/xfs_iops.c | 34 +---------------------------------
fs/xfs/xfs_symlink.c | 19 ++++++++++++++-----
2 files changed, 15 insertions(+), 38 deletions(-)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index a607d6aca5c4..72bdd7c79e93 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -511,27 +511,6 @@ xfs_vn_get_link(
return ERR_PTR(error);
}

-STATIC const char *
-xfs_vn_get_link_inline(
- struct dentry *dentry,
- struct inode *inode,
- struct delayed_call *done)
-{
- struct xfs_inode *ip = XFS_I(inode);
- char *link;
-
- ASSERT(ip->i_df.if_format == XFS_DINODE_FMT_LOCAL);
-
- /*
- * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
- * if_data is junk.
- */
- link = ip->i_df.if_u1.if_data;
- if (XFS_IS_CORRUPT(ip->i_mount, !link))
- return ERR_PTR(-EFSCORRUPTED);
- return link;
-}
-
static uint32_t
xfs_stat_blksize(
struct xfs_inode *ip)
@@ -1250,14 +1229,6 @@ static const struct inode_operations xfs_symlink_inode_operations = {
.update_time = xfs_vn_update_time,
};

-static const struct inode_operations xfs_inline_symlink_inode_operations = {
- .get_link = xfs_vn_get_link_inline,
- .getattr = xfs_vn_getattr,
- .setattr = xfs_vn_setattr,
- .listxattr = xfs_vn_listxattr,
- .update_time = xfs_vn_update_time,
-};
-
/* Figure out if this file actually supports DAX. */
static bool
xfs_inode_supports_dax(
@@ -1408,10 +1379,7 @@ xfs_setup_iops(
inode->i_fop = &xfs_dir_file_operations;
break;
case S_IFLNK:
- if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL)
- inode->i_op = &xfs_inline_symlink_inode_operations;
- else
- inode->i_op = &xfs_symlink_inode_operations;
+ inode->i_op = &xfs_symlink_inode_operations;
break;
default:
inode->i_op = &xfs_inode_operations;
diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c
index fc2c6a404647..4868bd986f52 100644
--- a/fs/xfs/xfs_symlink.c
+++ b/fs/xfs/xfs_symlink.c
@@ -22,6 +22,7 @@
#include "xfs_trace.h"
#include "xfs_trans.h"
#include "xfs_ialloc.h"
+#include "xfs_error.h"

/* ----- Kernel only functions below ----- */
int
@@ -101,12 +102,10 @@ xfs_readlink(
{
struct xfs_mount *mp = ip->i_mount;
xfs_fsize_t pathlen;
- int error = 0;
+ int error = -EFSCORRUPTED;

trace_xfs_readlink(ip);

- ASSERT(ip->i_df.if_format != XFS_DINODE_FMT_LOCAL);
-
if (xfs_is_shutdown(mp))
return -EIO;

@@ -121,12 +120,22 @@ xfs_readlink(
__func__, (unsigned long long) ip->i_ino,
(long long) pathlen);
ASSERT(0);
- error = -EFSCORRUPTED;
goto out;
}

+ if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
+ /*
+ * The VFS crashes on a NULL pointer, so return -EFSCORRUPTED if
+ * if_data is junk.
+ */
+ if (XFS_IS_CORRUPT(ip->i_mount, !ip->i_df.if_u1.if_data))
+ goto out;

- error = xfs_readlink_bmap_ilocked(ip, link);
+ memcpy(link, ip->i_df.if_u1.if_data, ip->i_disk_size + 1);
+ error = 0;
+ } else {
+ error = xfs_readlink_bmap_ilocked(ip, link);
+ }

out:
xfs_iunlock(ip, XFS_ILOCK_SHARED);